102040091 has 2 divisors, whose sum is σ = 102040092. Its totient is φ = 102040090.

The previous prime is 102040079. The next prime is 102040093. The reversal of 102040091 is 190040201.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 102040091 - 2⁶ = 102040027 is a prime.

Together with 102040093, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (102040093) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51020045 + 51020046.

It is an arithmetic number, because the mean of its divisors is an integer number (51020046).

Almost surely, 2^102040091 is an apocalyptic number.

102040091 is a deficient number, since it is larger than the sum of its proper divisors (1).

102040091 is an equidigital number, since it uses as much as digits as its factorization.

102040091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72, while the sum is 17.

The square root of 102040091 is about 10101.4895436267. The cubic root of 102040091 is about 467.2940799580.

Adding to 102040091 its reverse (190040201), we get a palindrome (292080292).

The spelling of 102040091 in words is "one hundred two million, forty thousand, ninety-one".